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United States Patent | 5,206,038 |
Yonezawa | April 27, 1993 |
A wedge type locking member (27) is brought into contact with a first piston (12) for clamping by means of a pushing spring (28). Thereby, the first piston (12) is prevented from returning from the clamping position (X) to the unclamping position (Y). The locking member (27) is provided with two pressure receiving surfaces (F)(S) having substantially equal areas. A fluid pressure within a first actuation chamber (13) for clamping acts upon these pressure receiving surfaces (F)(S). The locking condition of the locking member (27) is cancelled by means of a second piston (39).
Inventors: | Yonezawa; Keitaro (Kobe, JP) |
Assignee: | Kabushiki Kaisha KOSMEK (JP) |
Appl. No.: | 808007 |
Filed: | December 16, 1991 |
Dec 28, 1990[JP] | 2-417580 |
Current U.S. Class: | 425/450.1; 425/192R; 425/195; 425/595 |
Intern'l Class: | B28B 001/00 |
Field of Search: | 425/450.1,451.4,595,193,195 100/918 |
5118269 | Jun., 1992 | Klose et al. | 425/195. |
Foreign Patent Documents | |||
1576097 | Oct., 1969 | DE. | |
3838995 | Jun., 1989 | DE. | |
1-154833 | Jun., 1989 | JP. | |
2184488 | Jun., 1987 | GB. | |
8806684 | Sep., 1988 | WO. |